I don't like the idea of having something sticking out of the bar and getting in the way. I use a 16 inch bar in my MS390. From the tip of the bar to a notch on the sprocket cover is 19 inches. My VC Vig is 22 inches wide so 19 inch splits work great. I just put lay the saw in line with the log, placing the tip of the saw at the end of the log or latest cut and then eyeball where the sprocket cover notch lies and that's where I make my cut. My rounds come out very uniform. This is also quicker than marking your cuts with a tape measure and a can of spray paint. But, we've all got to do whatever works best for us.